. >>> to presidential politics now and five weeks until the election. the candidates are spending their last full day of prep before tomorrow night's all-important debate in denver. tahman bradley has more at what's at stake in their first faceoff. >> reporter: the stage is almost ready at the university of denver, where tomorrow night, president obama and mitt romney will go head-to-head during the first presidential debate. at a rally last night in denver, romney previewed one of his attacks. >> we had 40-straight weeks of unemployment above 8%. and what does the president say to all this? he says forward. i think forewarned a better term. >> reporter: romney's trailing president obama in polls. and his campaign knows the upcoming debates could be their best chance to turn things around. that's why the candidate is practicing. huddled with mock advisers. in the mock debates, senator rob portman is playing barack obama. >> i don't like him very much anymore. >> reporter: as for president obama, he took a break from practice yesterday to visit a campaig